The number 697
697 is a composite number with 4 divisors. Its prime factorisation is 17 × 41. Divisors (4): 1, 17, 41, 697.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 697: a semiprime: 17 × 41, the product of two primes.
- 2
697 is composite. Its prime factorisation is
- 3
The divisors add up to 756; without 697 itself that is 59, so 697 is deficient (59 is less than 697). Euler's totient φ(697) = 640 numbers up to 697 share no factor with it.
- 4
The digits of 697 add up to 22, and repeating that until one digit is left gives the digital root 4. The Collatz sequence (halve if even, else 3n+1) takes 126 steps to reach 1.
LaTeX source of the formulas on this page
\[ 697 = 17 \times 41 \]
697 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 756 |
| Euler totient φ(n) | 640 |
| Square | 485809 |
| Cube | 338608873 |
| Square root | 26.400758 |
| Digit sum / digital root | 22 / 4 |
| Collatz steps to 1 | 126 |
| Scientific notation | 6.97 × |
697 in other forms
| Form | Value |
|---|---|
| In words | six hundred and ninety-seven |
| Roman numerals | DCXCVII |
| Binary (base 2) | 1010111001 |
| Octal (base 8) | 1271 |
| Hexadecimal (base 16) | 2B9 |
| Base 3 | 221211 |
| As time | 697 seconds = 11 min 37 s |
Is 697 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 2) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 4) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 4) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 7) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 697 a prime number?
No. 697 = 17 × 41, so it is divisible by 17.
What are the factors of 697?
1, 17, 41, 697.
What is 697 in binary?
1010111001 (hexadecimal 2B9, octal 1271).
What is the square root of 697?
About 26.4008.
What is 697 in Roman numerals?
DCXCVII.
Is 697 divisible by 3?
No. Its digits add up to 22, which is not a multiple of 3.
What is special about the number 697?
697 is a semiprime: 17 × 41, the product of two primes.